Energy

Energy

1. mechanical waves

   • mechanical waves need an elastic medium (solid, liquid or gas) to propagate
   • The particles of the medium oscillate around a fixed point, so there is no net transport of matter through the medium.
   • like in the case of a carpet or a whip whose end is shaken, the carpet does not move, however a wave propagates through it.
   • Within the mechanical waves we have
     • the elastic waves
       • They are a tensional disturbance that propagates along an elastic medium.
       • For example, seismic waves cause tremors that can be treated as elastic waves that propagate through the ground which can cause damage in areas where there are urban settlements.
     • the seismic waves
       • Seismic waves are a type of strong elastic wave in the propagation of temporary disturbances of the stress field that generate small movements in the tectonic plates.
     • the sound waves
       • The sound waves are longitudinal waves that when reaching our ear produce the effect that we know as sound.
     • the gravity waves.
       • Gravitational waves are the deformations of space-time.
       • they are not waves that propagate in space and time, but disturbances that alter these same dimensions

2. Electromagnetic waves

   • They are those waves that do not need a material means to spread. They include, among others, visible light and radio waves, television and telephony.
   • All propagate in vacuum at a constant speed, very high (300 0000 km / s) but not infinite